lttng-sessiond/ust-app.h

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; only version 2
   7  * of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #ifndef _LTT_UST_APP_H
  20 #define _LTT_UST_APP_H
  21
  22 #include <stdint.h>
  23 #include <urcu/list.h>
  24
  25 #include "trace-ust.h"
  26
  27 #define UST_APP_EVENT_LIST_SIZE 32
  28
  29 extern int ust_consumer_fd;
  30
  31 /*
  32  * Application registration data structure.
  33  */
  34 struct ust_register_msg {
  35         uint32_t major;
  36         uint32_t minor;
  37         pid_t pid;
  38         pid_t ppid;
  39         uid_t uid;
  40         gid_t gid;
  41         char name[16];
  42 };
  43
  44 /*
  45  * Global applications HT used by the session daemon.
  46  */
  47 struct cds_lfht *ust_app_ht;
  48
  49 struct cds_lfht *ust_app_sock_key_map;
  50
  51 struct ust_app_key {
  52         pid_t pid;
  53         int sock;
  54         struct cds_lfht_node node;
  55 };
  56
  57 struct ust_app_event {
  58         int enabled;
  59         int handle;
  60         struct lttng_ust_object_data *obj;
  61         struct lttng_ust_event attr;
  62         char name[LTTNG_UST_SYM_NAME_LEN];
  63         struct cds_lfht *ctx;
  64         struct cds_lfht_node node;
  65 };
  66
  67 struct ust_app_channel {
  68         int enabled;
  69         int handle;
  70         char name[LTTNG_UST_SYM_NAME_LEN];
  71         struct lttng_ust_channel attr;
  72         struct lttng_ust_object_data *obj;
  73         struct ltt_ust_stream_list streams;
  74         struct cds_lfht *ctx;
  75         struct cds_lfht *events;
  76         struct cds_lfht_node node;
  77 };
  78
  79 struct ust_app_session {
  80         int enabled;
  81         /* started: has the session been in started state at any time ? */
  82         int started;  /* allows detection of start vs restart. */
  83         int handle;   /* Used has unique identifier */
  84         unsigned int uid;
  85         struct ltt_ust_metadata *metadata;
  86         struct lttng_ust_object_data *obj;
  87         struct cds_lfht *channels; /* Registered channels */
  88         struct cds_lfht_node node;
  89         char path[PATH_MAX];
  90 };
  91
  92 /*
  93  * Registered traceable applications. Libust registers to the session daemon
  94  * and a linked list is kept of all running traceable app.
  95  */
  96 struct ust_app {
  97         pid_t ppid;
  98         uid_t uid;           /* User ID that owns the apps */
  99         gid_t gid;           /* Group ID that owns the apps */
 100         uint32_t v_major;    /* Verion major number */
 101         uint32_t v_minor;    /* Verion minor number */
 102         char name[17];       /* Process name (short) */
 103         struct cds_lfht *sessions;
 104         struct cds_lfht_node node;
 105         struct ust_app_key key;
 106 };
 107
 108 #ifdef HAVE_LIBLTTNG_UST_CTL
 109
 110 int ust_app_register(struct ust_register_msg *msg, int sock);
 111 void ust_app_unregister(int sock);
 112 int ust_app_create_channel_all(struct ltt_ust_session *usess,
 113                 struct ltt_ust_channel *uchan);
 114 int ust_app_create_event_all(struct ltt_ust_session *usess,
 115                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
 116 unsigned long ust_app_list_count(void);
 117 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app);
 118 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app);
 119 int ust_app_start_trace_all(struct ltt_ust_session *usess);
 120 int ust_app_stop_trace_all(struct ltt_ust_session *usess);
 121 int ust_app_list_events(struct lttng_event **events);
 122 void ust_app_global_update(struct ltt_ust_session *usess, int sock);
 123
 124 void ust_app_clean_list(void);
 125 void ust_app_ht_alloc(void);
 126 struct cds_lfht *ust_app_get_ht(void);
 127 struct ust_app *ust_app_find_by_pid(pid_t pid);
 128
 129 #else /* HAVE_LIBLTTNG_UST_CTL */
 130
 131 static inline
 132 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
 133 {
 134         return 0;
 135 }
 136 static inline
 137 int ust_app_start_trace_all(struct ltt_ust_session *usess)
 138 {
 139         return 0;
 140 }
 141 static inline
 142 int ust_app_list_events(struct lttng_event **events)
 143 {
 144         return 0;
 145 }
 146 static inline
 147 int ust_app_register(struct ust_register_msg *msg, int sock)
 148 {
 149         return -ENOSYS;
 150 }
 151 static inline
 152 void ust_app_unregister(int sock)
 153 {
 154 }
 155 static inline
 156 unsigned int ust_app_list_count(void)
 157 {
 158         return 0;
 159 }
 160 static inline
 161 void ust_app_lock_list(void)
 162 {
 163 }
 164 static inline
 165 void ust_app_unlock_list(void)
 166 {
 167 }
 168 static inline
 169 void ust_app_clean_list(void)
 170 {
 171 }
 172 static inline
 173 struct ust_app_list *ust_app_get_list(void)
 174 {
 175         return NULL;
 176 }
 177 static inline
 178 struct ust_app *ust_app_get_by_pid(pid_t pid)
 179 {
 180         return NULL;
 181 }
 182 static inline
 183 int ust_app_add_channel_all(struct ltt_ust_session *usess,
 184                 struct ltt_ust_channel *uchan)
 185 {
 186         return 0;
 187 }
 188 static inline
 189 int ust_app_add_event_all(struct ltt_ust_session *usess,
 190                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
 191 {
 192         return 0;
 193 }
 194 static inline
 195 struct cds_lfht *ust_app_get_ht(void)
 196 {
 197         return NULL;
 198 }
 199 static inline
 200 void ust_app_ht_alloc(void)
 201 {
 202 }
 203 static inline
 204 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
 205 {
 206 }
 207
 208 #endif /* HAVE_LIBLTTNG_UST_CTL */
 209
 210 #endif /* _LTT_UST_APP_H */